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    <title>Document</title>
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        <script type="text/javascript">
            function WebSocketTest() {
               if ("WebSocket" in window){
                  console.log("您的浏览器支持 WebSocket!");                  
                  // 打开一个 web socket
                  var ws = new WebSocket("wss://172.31.4.248:18080/sc1902/handler");                   
                  ws.onopen = function(){
                     // Web Socket 已连接上，使用 send() 方法发送数据
                     let data = {
                         type:'UserId',
                         body:'SUPERADMIN'
                     };
                     ws.send(JSON.stringify(data));
                     console.log("数据发送中...");
                  };                   
                  ws.onmessage = function (evt) { 
                     var received_msg = evt.data;
                     console.log("数据已接收...");
                  };                   
                  ws.onclose = function(){ 
                     // 关闭 websocket
                     console.log("连接已关闭..."); 
                  };
               } else {
                  // 浏览器不支持 WebSocket
                  alert("您的浏览器不支持 WebSocket!");
               }
            }
            WebSocketTest();

            function test(){
               
            }
         </script>
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